XXXTentacion, without an ounce of doubt, will be remembered as this generation’s Tupac and anyone who disagrees can kick rocks … so says his former manager, Adam Grandmaison.

TMZ got Adam outside his popular ONSOMESHIT store Wednesday night on Melrose and he straight-up asked him if XXX will go down as the Tupac of this generation. As you know, Pac’s career was cut short when he was brutally gunned down in 1996 on the Vegas strip. He was 25.

As was reported … XXX was murdered in South Florida at age 20. Check it out … Adam — who is known for his No Jumper podcast, organized XXX’s L.A. memorial, which cops treated as a “riot”, is adamant comparing XXX to Pac is NOT far-fetched and he explains why.